US11698124B2 - Transmission and work vehicle - Google Patents

Transmission and work vehicle Download PDF

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Publication number
US11698124B2
US11698124B2 US17/782,328 US202017782328A US11698124B2 US 11698124 B2 US11698124 B2 US 11698124B2 US 202017782328 A US202017782328 A US 202017782328A US 11698124 B2 US11698124 B2 US 11698124B2
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Prior art keywords
gear
shaft
output
rotation element
transfer shaft
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US17/782,328
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US20230042113A1 (en
Inventor
Yusuke Miura
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Komatsu Ltd
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Komatsu Ltd
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Assigned to KOMATSU LTD. reassignment KOMATSU LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIURA, YUSUKE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F16H47/04—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/202—Mechanical transmission, e.g. clutches, gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/415—Wheel loaders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/10—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts
    • F16H2037/104—Power split variators with one end of the CVT connected or connectable to two or more differentials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/10—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts
    • F16H2037/105—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts characterised by number of modes or ranges, e.g. for compound gearing
    • F16H2037/108—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts characterised by number of modes or ranges, e.g. for compound gearing with switching means to provide four or more variator modes or ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/20—Transmissions using gears with orbital motion
    • F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
    • F16H2200/2017—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with six sets of orbital gears

Definitions

  • the present disclosure relates to a transmission and a work vehicle.
  • a continuous speed variation-capable transmission such as a hydraulic mechanical transmission (HMT) is known in the prior art.
  • the transmission in Japanese Patent Laid-open No. 2006-329244 includes a first planetary gear mechanism, a second planetary gear mechanism, a first motor, and a second motor.
  • An input shaft of the transmission is connected to a sun gear of the first planetary gear mechanism through an FR conversion mechanism
  • a ring gear of the first planetary gear mechanism is connected to a carrier of the second planetary gear mechanism through a clutch.
  • a ring gear of the second planetary gear mechanism is connected to an output shaft.
  • the first motor is connected to a carrier of the first planetary gear mechanism
  • the second motor is connected to the ring gear of the first planetary gear mechanism
  • the rotation speeds of the first motor and the second motor are controlled in the transmission in Japanese Patent Laid-open No. 2006-329244 whereby the speed ratio ofthe output shaft with respect to the input shaft is varied in a continuous manner.
  • the rotation speed of the first motor or the second motor is set to zero when the vehicle speed is zero while the first motor or the second motor is connected to the output shaft through the first planetary gear mechanism or the second planetary gear mechanism In this case, leakage of hydraulic fluid in the motors increases thereby reducing the energy efficiency of the transmission
  • An object of the present disclosure is to improve energy efficiency in a transmission including a continuous speed variation mechanism
  • a transmission includes a continuous speed variation mechanism, a first transfer shaft, a planetary gear mechanism, a second transfer shaft, a first driven gear, and an output shaft.
  • the continuous speed variation mechanism includes an input shaft, a first gear mechanism, a first output gear, a second gear mechanism, a second output gear, and a motor.
  • the first gear mechanism is connected to the input shaft.
  • the first output gear is connected to the first gear mechanism.
  • the second gear mechanism is connected to the input shaft.
  • the second output gear is connected to the second gear mechanism
  • the motor is connected to the first gear mechanism and the second gear mechanism The motor continuously varies the speed ratio of the first output gear with respect to the input shaft and the speed ratio of the second output gear with respect to the input shaft.
  • the planetary gear mechanism includes a first rotation element, a second rotation element, and a third rotation element.
  • the planetary gear mechanism is rotatable about the first transfer shaft.
  • the first driven gear is rotatable about the second transfer shaft.
  • the first output gear is connected to the first rotation element.
  • the second output gear is connected to the second rotation element through the first driven gear.
  • the output shaft is connected to the third rotation element.
  • a work vehicle according to another aspect of the present disclosure includes the above-mentioned transmission
  • the rotation from the continuous speed variation mechanism in the transmission according to the present disclosure is output separately into the first output gear and the second output gear.
  • the rotation from the first output gear is transmitted to the first rotation element of the planetary gear mechanism
  • the rotation from the second output gear is transmitted to the second rotation element of the planetary gear mechanism through the first driven gear.
  • the rotation from the first output gear and the rotation from the second output gear are combined in the planetary gear mechanism and transmitted to the output shaft.
  • FIG. 1 is a side view of a work vehicle according to an embodiment
  • FIG. 2 is a skeleton view of a transmission according to the embodiment.
  • FIG. 3 is a skeleton view of the transmission depicting a transmission path during a forward low-speed mode.
  • FIG. 4 is a skeleton view of the transmission depicting a transmission path during a forward high-speed mode.
  • FIG. 5 is a skeleton view of the transmission depicting a transmission path during a reverse low-speed mode.
  • FIG. 6 is a skeleton view of the transmission depicting a transmission path during a reverse high-speed mode.
  • FIG. 1 is a side view of a work vehicle 1 according to an embodiment of the present disclosure.
  • the work vehicle 1 includes a vehicle body 2 and a work implement 3 .
  • the vehicle body 2 includes a front vehicle body 2 a and a rear vehicle body 2 b .
  • the rear vehicle body 2 b is connected so as to turn to the left and right with respect to the front vehicle body 2 a
  • the front vehicle body 2 a and the rear vehicle body 2 b are coupled by a hydraulic cylinder 15 .
  • the hydraulic cylinder 15 extends and contracts whereby the front vehicle body 2 a turns to the left and right with respect to the rear vehicle body 2 b.
  • the work implement 3 is used for work, such as excavation.
  • the work implement 3 is attached to the front vehicle body 2 a .
  • the work implement 3 includes a boom 11 , a bucket 12 , and hydraulic cylinders 13 and 14 .
  • the hydraulic cylinders 13 and 14 extend and contract thereby actuating the boom 11 and the bucket 12 .
  • the work vehicle 1 includes an engine 21 , a transmission 23 , and a travel device 24 .
  • the engine 21 is an internal combustion engine, such as a diesel engine.
  • the transmission 23 is connected to the engine 21 .
  • the transmission is configured to vary the transmission gear ratio in a continuous manner
  • the travel device 24 causes the work vehicle 1 to travel.
  • the travel device 24 includes front wheels 25 and rear wheels 26 .
  • the front wheels 25 are provided to the front vehicle body 2 a
  • the rear wheels 26 are provided to the rear vehicle body 2 b .
  • the front wheels 25 and the rear wheels 26 are connected to the transmission 23 through axles, which are not illustrated.
  • the work vehicle 1 includes a hydraulic pump 28 .
  • the hydraulic pump 28 is connected to the engine 21 .
  • the hydraulic pump 28 is driven by the engine 21 and discharges hydraulic fluid.
  • the hydraulic fluid discharged from the hydraulic pump 28 is supplied to the above-mentioned hydraulic cylinders 13 to 15 .
  • the work vehicle 1 includes a controller 27 .
  • the controller 27 includes, for example, a processor and a memory. The controller 27 controls the engine 21 and the transmission 23 .
  • FIG. 2 is a skeleton view depicting a configuration of the transmission 23 .
  • the transmission 23 includes a continuous speed variation mechanism 31 and a transfer mechanism 32 .
  • the continuous speed variation mechanism 31 is connected to the engine 21 .
  • the continuous speed variation mechanism 31 includes an input shaft 33 , an intermediate shaft 34 , a first gear mechanism 35 , a first output gear 36 , a second gear mechanism 37 , a second output gear 38 , a first motor 41 , and a second motor 42 .
  • the input shaft 33 is connected to the engine 21 .
  • the intermediate shaft 34 is disposed eccentrically from the input shaft 33 .
  • the first gear mechanism 35 is connected to the input shaft 33 .
  • the first output gear 36 is connected to the first gear mechanism 35 .
  • the second gear mechanism 37 is connected to the input shaft 33 .
  • the second output gear 38 is connected to the second gear mechanism 37 .
  • the first gear mechanism 35 includes a first input gear 43 and a first planetary gear mechanism 44 .
  • the first input gear 43 is coupled to the input shaft 33 .
  • the first planetary gear mechanism 44 is disposed coaxially with the intermediate shaft 34 .
  • the first planetary gear mechanism 44 is rotatable about the intermediate shaft 34 .
  • the first planetary gear mechanism 44 includes a first carrier 45 , a plurality of first planetary gears 46 , a first sun gear 47 , and a first ring gear 48 .
  • the first carrier 45 is rotatable relative to the intermediate shaft 34 .
  • the first carrier 45 is coupled to a gear 49 .
  • the gear 49 meshes with the first input gear 43 .
  • the first carrier 45 is connected to the first input gear 43 through the gear 49 .
  • the first planetary gears 46 are rotatably held on the first carrier 45 .
  • the first planetary gears 46 are configured to revolve about the intermediate shaft 34 due to the rotation of the first carrier 45 about the intermediate shaft 34 .
  • the first sun gear 47 meshes with the first planetary gears 46 and is connected to the first planetary gears 46 .
  • the first sun gear 47 is coupled to the intermediate shaft 34 .
  • the first sun gear 47 rotates with the intermediate shaft 34 .
  • the first ring gear 48 is connected to the first planetary gears 46 .
  • the first ring gear 48 includes an internal gear 50 and an external gear 51 .
  • the internal gear 50 of the first ring gear 48 meshes with the first planetary gears 46 .
  • the second gear mechanism 37 includes a second input gear 52 and a second planetary gear mechanism 53 .
  • the second input gear 52 is coupled to the input shaft 33 .
  • the second planetary gear mechanism 53 is disposed coaxially with the intermediate shaft 34 .
  • the second planetary gear mechanism 53 is rotatable about the intermediate shaft 34 .
  • the second planetary gear mechanism 53 includes a second sun gear 54 , a plurality of second planetary gears 55 , a second carrier 56 , and a second ring gear 57 .
  • the second sun gear 54 is coupled to a gear 58 .
  • the gear 58 meshes with the second input gear 52 .
  • the second sun gear 54 is connected to the second input gear 52 through the gear 58 .
  • the second sun gear 54 is rotatable about the intermediate shaft 34 .
  • the second sun gear 54 is rotatable relative to the intermediate shaft 34 .
  • the second planetary gears 55 mesh with the second sun gear 54 and are connected to the second sun gear 54 .
  • the second planetary gears 55 are rotatably held on the second carrier 56 .
  • the second carrier 56 is rotatable about the intermediate shaft 34 .
  • the second carrier 56 is rotatable relative to the intermediate shaft 34 .
  • the second planetary gears 55 are configured to revolve about the intermediate shaft 34 due to the rotation of the second carrier 56 about the intermediate shaft 34 .
  • the second ring gear 57 is connected to the second planetary gears 55 .
  • the second ring gear 57 includes an internal gear 59 and an external gear 60 .
  • the internal gear 59 of the second ring gear 57 meshes with the second planetary gears 55 .
  • the first motor 41 is a hydraulic pump/motor.
  • a rotating shaft 61 of the first motor 41 is disposed eccentrically from the intermediate shaft 34 .
  • a first motor gear 62 and a second motor gear 63 are coupled to the rotating shaft 61 of the first motor 41 .
  • the first motor gear 62 meshes with the external gear 51 of the first ring gear 48 .
  • the first ring gear 48 is connected to the rotating shaft 61 of the first motor 41 through the first motor gear 62 .
  • the second motor gear 63 meshes with the external gear 60 of the second ring gear 57 .
  • the second ring gear 57 is connected to the rotating shaft 61 of the first motor 41 through the second motor gear 63 .
  • the second motor 42 is a hydraulic pump/motor.
  • the second motor 42 is connected to the first motor 41 through a hydraulic circuit 30 .
  • the second motor 42 is disposed coaxially with the intermediate shaft 34 .
  • a rotating shaft of the second motor 42 is coupled directly to the intermediate shaft 34 .
  • the first planetary gear mechanism 44 is disposed between the second motor 42 and the second planetary gear mechanism 53 in the direction in which the intermediate shaft 34 extends.
  • the second motor 42 When the first motor 41 functions as a pump and discharges hydraulic fluid, the second motor 42 functions as a motor and is driven by the hydraulic fluid from the first motor 41 . Conversely, when the second motor 42 functions as a pump and discharges hydraulic fluid, the first motor 41 functions as a motor and is driven by the hydraulic fluid from the second motor 42 .
  • the first output gear 36 is disposed coaxially with the intermediate shaft 34 .
  • the first output gear 36 is coupled to the intermediate shaft 34 .
  • the first output gear 36 is connected to the first sun gear 47 through the intermediate shaft 34 .
  • the first output gear 36 rotates with the intermediate shaft 34 .
  • the second output gear 38 is disposed coaxially with the intermediate shaft 34 .
  • the second output gear 38 is disposed coaxially with the first output gear 36 .
  • the second output gear 38 is coupled to the second carrier 56 .
  • the second output gear 38 is rotatable with the second carrier 56 about the intermediate shaft 34 .
  • the second output gear 38 is rotatable relative to the intermediate shaft 34 .
  • the capacity and/or the discharge pressure of the first motor 41 is controlled by the controller 27 .
  • the controller 27 controls the rotation speed of the first motor 41 . Consequently, the first motor 41 continuously varies the speed ratio of the first output gear 36 with respect to the input shaft 33 and the speed ratio of the second output gear 38 with respect to the input shaft 33 .
  • the capacity and/or the discharge pressure of the second motor 42 is controlled by the controller 27 .
  • the controller 27 controls the rotation speed of the second motor 42 . Consequently, the second motor 42 continuously varies the speed ratio of the first output gear 36 with respect to the input shaft 33 and the speed ratio of the second output gear 38 with respect to the input shaft 33 .
  • the transfer mechanism 32 is connected to the continuous speed variation mechanism 31 and the travel device 24 .
  • the transfer mechanism 32 transmits driving power from the continuous speed variation mechanism 31 to the travel device 24 .
  • the transfer mechanism 32 includes a first transfer shaft 64 , a third planetary gear mechanism 65 , a second transfer shaft 66 , a first driven gear 67 , a second driven gear 68 , and an output shaft 69 .
  • the transfer mechanism 32 includes a first clutch C 1 , a second clutch C 2 , a third clutch C 3 , and a fourth clutch C 4 .
  • the first transfer shaft 64 is disposed eccentrically from the intermediate shaft 34 .
  • a first transfer gear 70 is coupled to the first transfer shaft 64 .
  • the first transfer gear 70 rotates with the first transfer shaft 64 .
  • the second transfer shaft 66 is disposed eccentrically from the intermediate shaft 34 .
  • the second transfer shaft 66 is disposed eccentrically from the first transfer shaft 64 .
  • a second transfer gear 71 is coupled to the second transfer shaft 66 .
  • the second transfer gear 71 rotates with the second transfer shaft 66 .
  • the third planetary gear mechanism 65 is disposed coaxially with the first transfer shaft 64 .
  • the third planetary gear mechanism 65 is rotatable about the first transfer shaft 64 .
  • the third planetary gear mechanism 65 includes a third sun gear 72 , a plurality of third planetary gears 73 , a third carrier 74 , and a third ring gear 75 .
  • the third sun gear 72 is coupled to a gear 76 .
  • the gear 76 rotates with the third sun gear 72 .
  • the third sun gear 72 is rotatable relative to the first transfer shaft 64 .
  • the third sun gear 72 is connected to the first transfer shaft 64 through the fourth clutch C 4 .
  • the fourth clutch C 4 couples the third sun gear 72 to the first transfer shaft 64 in an engaged state. Therefore, the third sun gear 72 rotates with the first transfer shaft 64 while the fourth clutch C 4 is in the engaged state.
  • the fourth clutch C 4 uncouples the third sun gear 72 from the first transfer shaft 64 in a disengaged state. Therefore, the third sun gear 72 is rotatable idly with respect to the first transfer shaft 64 while the fourth clutch C 4 is in the disengaged state.
  • the third planetary gears 73 mesh with the third sun gear 72 and are connected to the third sun gear 72 .
  • the third planetary gears 73 are rotatably held on the third carrier 74 .
  • the third canier 74 is rotatable about the first transfer shaft 64 .
  • the third planetary gears 73 are configured to revolve about the first transfer shaft 64 due to the rotation of the third canier 74 about the first transfer shaft 64 .
  • the third canier 74 is coupled to a gear 77 .
  • the gear 77 rotates with the third canier 74 .
  • the third canier 74 is rotatable relative to the first transfer shaft 64 .
  • the third canier 74 is connected to the first transfer shaft 64 through the first clutch C 1 .
  • the first clutch C 1 couples the third canier 74 to the first transfer shaft 64 in an engaged state. Therefore, the third canier 74 rotates with the first transfer shaft 64 while the first clutch C 1 is in the engaged state.
  • the first clutch C 1 uncouples the third canier 74 from the first transfer shaft 64 in a disengaged state. Therefore, the third canier 74 is rotatable idly with respect to the first transfer shaft 64 while the first clutch C 1 is in the disengaged state.
  • the third ring gear 75 is connected to the third planetary gears 73 .
  • the third ring gear 75 is connected to the first output gear 36 .
  • the third ring gear 75 includes an internal gear 78 and an external gear 79 .
  • the internal gear 78 of the third ring gear 75 meshes with the third planetary gears 73 .
  • the external gear 79 of the third ring gear 75 meshes with the first output gear 36 .
  • the first driven gear 67 is disposed coaxially with the second transfer shaft 66 .
  • the first driven gear 67 is rotatable relative to the second transfer shaft 66 .
  • the first driven gear 67 meshes with the second output gear 38 .
  • the first driven gear 67 is connected to the second output gear 38 .
  • the first driven gear 67 meshes with the gear 76 .
  • the first driven gear 67 is connected to the third sun gear 72 through the gear 76 .
  • the first driven gear 67 is connected to the second transfer shaft 66 through the second clutch C 2 .
  • the second clutch C 2 couples the first driven gear 67 to the second transfer shaft 66 in an engaged state. Therefore, the first driven gear 67 rotates with the second transfer shaft 66 while the second clutch C 2 is in the engaged state.
  • the second clutch C 2 uncouples the first driven gear 67 from the second transfer shaft 66 in a disengaged state. Therefore, the first driven gear 67 is rotatable idly with respect to the second transfer shaft 66 while the second clutch C 2 is in the disengaged state.
  • the second driven gear 68 is disposed coaxially with the second transfer shaft 66 .
  • the second driven gear 68 is rotatable relative to the second transfer shaft 66 .
  • the second driven gear 68 meshes with the gear 77 .
  • the second driven gear 68 is connected to the third carrier 74 through the gear 77 .
  • the second driven gear 68 is connected to the second transfer shaft 66 through the third clutch C 3 .
  • the third clutch C 3 couples the second driven gear 68 to the second transfer shaft 66 in an engaged state. Therefore, the second driven gear 68 rotates with the second transfer shaft 66 while the third clutch C 3 is in the engaged state.
  • the third clutch C 3 uncouples the second driven gear 68 from the second transfer shaft 66 in a disengaged state. Therefore, the second driven gear 68 is rotatable idly with respect to the second transfer shaft 66 while the third clutch C 3 is in the disengaged state.
  • the output shaft 69 is connected to the travel device 24 .
  • the output shaft 69 is disposed eccentrically from the first transfer shaft 64 and the second transfer shaft 66 .
  • the output shaft 69 is disposed eccentrically from the intermediate shaft 34 .
  • Agear 80 is coupled to the output shaft 69 .
  • the gear 80 meshes with the first transfer gear 70 and the second transfer gear 71 .
  • the output shaft 69 is connected to the first transfer shaft 64 through the gear 80 and the first transfer gear 70 .
  • the output shaft 69 is connected to the second transfer shaft 66 through the gear 80 and the second transfer gear 71 .
  • the controller 27 switches the transmission path in the transmission 23 in accordance with the vehicle speed.
  • the controller 27 switches the transmission path in the transmission 23 in accordance with the travel direction.
  • the controller 27 selects a mode corresponding to the vehicle speed and the travel direction from a plurality of control modes that define transmission paths.
  • the plurality of control modes includes a forward low-speed mode, a forward high-speed mode, a reverse low-speed mode, and a reverse high-speed mode.
  • FIG. 3 is a view illustrating a transmission path in the forward low-speed mode.
  • the controller 27 sets the control mode to the forward low-speed mode while the travel direction is forward and the vehicle speed is in a range from zero to a first threshold.
  • the controller 27 sets the first clutch C 1 to the engaged state and sets the second to fourth clutches C 2 to C 4 to the disengaged states.
  • the driving power from the engine 21 is transmitted from the input shaft 33 to the first motor 41 through the first input gear 43 , the gear 49 , the first carrier 45 , the first planetary gears 46 , the first ring gear 48 , and the first motor gear 62 .
  • the first motor 41 functions as a pump and discharges hydraulic fluid.
  • the second motor 42 is driven by the hydraulic fluid discharged by the first motor 41 and functions as a motor.
  • the second motor 42 causes the first sun gear 47 and the intermediate shaft 34 to rotate and, as a result, the first output gear 36 rotates.
  • the driving power from the engine 21 is transmitted from the input shaft 33 to the second output gear 38 through the second input gear 52 , the gear 58 , the second sun gear 54 , the second planetary gears 55 , and the second carrier 56 .
  • the second output gear 38 rotates.
  • the driving power from the first output gear 36 is transmitted to the third planetary gears 73 through the external gear 79 and the third ring gear 75 .
  • the driving power from the second output gear 38 is transmitted to the third planetary gears 73 through the first driven gear 67 , the gear 76 , and the third sun gear 72 . Therefore, the driving power from the first output gear 36 and the driving power from the second output gear 38 are combined at the third planetary gear mechanism 65 .
  • the combined driving power is transmitted to the output shaft 69 through the third carrier 74 , the first clutch C 1 , the first transfer shaft 64 , the first transfer gear 70 , and the gear 80 .
  • the controller 27 controls the outputs of the first motor 41 and the second motor 42 so that the speed ratio of the transmission 23 increases in accordance with an increase in the vehicle speed.
  • the speed ratio of the transmission 23 is the rotation speed of the output shaft 69 with respect to the rotation speed of the input shaft 33 .
  • the controller 27 controls the outputs of the first motor 41 and the second motor 42 so that the speed ratio varies in a continuous manner in accordance with the vehicle speed.
  • the rotation speed of the third carrier 74 becomes zero while the rotation speed of the first motor 41 is a first rotation speed and the rotation speed of the second motor 42 is a second rotation speed.
  • the first rotation speed and the second rotation speed are greater than zero.
  • the rotation speed of the first motor 41 is the first rotation speed and the rotation speed of the second motor 42 is the second rotation speed
  • the product of the rotation of the third sun gear 72 due to the driving power from the second output gear 38 and the number of teeth of the third sun gear 72 are in opposite directions and are the same size.
  • the first rotation speed and the second rotation speed may be determined by taking into account a balance between the energy efficiency and the fuel consumption of the first motor 41 and the second motor 42 .
  • FIG. 4 is a view illustrating a transmission path in the forward high-speed mode.
  • the controller 27 sets the second clutch C 2 to the engaged state and sets the first, third, and fourth clutches C 1 , C 3 , and C 4 to the disengaged states.
  • the driving power from the engine 21 is transmitted from the input shaft 33 to the second motor 42 through the first input gear 43 , the gear 49 , the first planetary gears 46 , and the first sun gear 47 .
  • the second motor 42 functions as a pump and discharges hydraulic fluid.
  • the first motor 41 is driven by the hydraulic fluid discharged by the second motor 42 and functions as a motor.
  • the driving power from the first motor 41 is transmitted to the second planetary gears 55 through the second motor gear 63 and the second ring gear 57 .
  • the driving power from the first input gear 43 and the driving power from the second input gear 52 are combined at the second planetary gear mechanism 53 .
  • the combined driving power is transmitted to the output shaft 69 through the second output gear 38 , the first driven gear 67 , the second clutch C 2 , the second transfer shaft 66 , the second transfer gear 71 , and the gear 80 .
  • FIG. 5 is a view illustrating a transmission path in the reverse low-speed mode.
  • the controller 27 sets the control mode to the reverse low-speed mode while the travel direction is reverse and the vehicle speed is in a range from zero to a second threshold.
  • the controller 27 sets the third clutch C 3 to the engaged state and sets the first, second, and fourth clutches C 1 , C 2 , and C 4 to the disengaged states.
  • the transmission path from the engine 21 through the continuous speed variation mechanism 31 to the third planetary gear mechanism 65 is the same as the forward low-speed mode.
  • the driving power from the first output gear 36 and the driving power from the second output gear 38 are combined at the third planetary gear mechanism 65 in the same way as the forward low-speed mode.
  • the combined driving power in the reverse low-speed mode is transmitted to the output shaft 69 through the third carrier 74 , the gear 77 , the second driven gear 68 , the third clutch C 3 , the second transfer shaft 66 , the second transfer gear 71 , and the gear 80 .
  • the rotation speed of the third carrier 74 becomes zero while the rotation speed of the first motor 41 is the first rotation speed and the rotation speed of the second motor 42 is the second rotation speed in the same way as the forward low-speed mode. Therefore, the rotation of the output shaft 69 can also be set to zero while the first motor 41 and the second motor 42 are rotating in the reverse low-speed mode. As a result, the state of the first motor 41 and the second motor 42 rotating can be maintained even if the work vehicle has stopped.
  • FIG. 6 is a view illustrating a transmission path in the reverse high-speed mode.
  • the controller 27 sets the fourth clutch C 4 to the engaged state and sets the first to third clutches C 1 to C 3 to the disengaged states.
  • the transmission path from the engine 21 to the second planetary gear mechanism 53 is the same as the forward high-speed mode.
  • the driving power from the first input gear 43 and the driving power from the second input gear 52 are combined at the second planetary gear mechanism 53 .
  • the combined driving power is transmitted to the output shaft 69 through the second output gear 38 , the first driven gear 67 , the gear 76 , the fourth clutch C 4 , the first transfer shaft 64 , the first transfer gear 70 , and the gear 80 .
  • the work vehicle 1 is not limited to a wheel loader and may be another vehicle, such as a bulldozer or a hydraulic excavator.
  • the configuration of the transmission 23 may be changed.
  • the connection relationships between the rotation elements of the first planetary gear mechanism 44 and the rotation elements of the second planetary gear mechanism 53 may be changed.
  • the connection relationships between the rotation elements of the first planetary gear mechanism 44 and the first and second motors 41 and 42 may be changed.
  • the connection relationships between the rotation elements of the first planetary gear mechanism 44 and the first output gear 36 may be changed.
  • connection relationships between the rotation elements ofthe second planetary gear mechanism 53 and the first and second motors 41 and 42 may be changed.
  • the connection relationships between the rotation elements of the second planetary gear mechanism 53 and the second output gear 38 may be changed.
  • the connection relationship between the third planetary gear mechanism 65 and the first transfer shaft 64 may be changed.
  • the connection relationship between the third planetary gear mechanism 65 and the first output gear 36 may be changed.
  • the connection relationship between the third planetary gear mechanism 65 and the second output gear 38 may be changed.
  • the dispositions of the clutches C 1 to C 4 may be changed.
  • the first motor 41 and the second motor 42 are not limited to hydraulic pump/motors and may be electric generator/motors.
  • the control modes are not limited to the above embodiment and may be changed.
  • the transmission paths illustrated in FIG. 5 and FIG. 6 may be the control modes for forward travel.
  • the transmission paths illustrated in FIG. 3 and FIG. 4 may be the control modes for reverse travel.
  • energy efficiency can be improved in a transmission including a continuous speed variation mechanism

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Structure Of Transmissions (AREA)
US17/782,328 2020-03-05 2020-12-07 Transmission and work vehicle Active US11698124B2 (en)

Applications Claiming Priority (3)

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JP2020037675A JP7426259B2 (ja) 2020-03-05 2020-03-05 トランスミッション及び作業車両
JP2020-037675 2020-03-05
PCT/JP2020/045392 WO2021176788A1 (fr) 2020-03-05 2020-12-07 Transmission et véhicule de chantier

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US20230042113A1 US20230042113A1 (en) 2023-02-09
US11698124B2 true US11698124B2 (en) 2023-07-11

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JP (1) JP7426259B2 (fr)
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US6203463B1 (en) 1999-12-16 2001-03-20 Caterpillar Inc. Transmission with variable ratio utilizing three planetaries, five members, a variable speed pump, and a variable speed motor and associated method for operatively connecting components associated therewith
JP2006329244A (ja) 2005-05-24 2006-12-07 Komatsu Ltd 変速装置
DE202009007972U1 (de) 2008-12-12 2010-05-12 Pitorqa Gmbh Stufenloses Fahr- und Anfahr-Stufengetriebe
WO2012171812A1 (fr) * 2011-06-14 2012-12-20 Valtra Oy Ab Transmission de véhicule à répartition du couple à variation continue
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JP2017075692A (ja) 2015-09-29 2017-04-20 ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフトＺｆ Ｆｒｉｅｄｒｉｃｈｓｈａｆｅｎ Ａｇ 遊星歯車セットを備えて少なくとも３つの走行レンジを有する無段のパワースプリット型変速機
CN206234335U (zh) 2016-12-07 2017-06-09 重庆大学 作业车辆液压机械复合无级变速器装置
CN110520651A (zh) * 2017-11-24 2019-11-29 株式会社久保田 拖拉机的变速传动装置及拖拉机
US11137052B2 (en) * 2019-08-29 2021-10-05 Deere & Company Transmission assembly with integrated CVP

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JPS60227045A (ja) 1984-04-25 1985-11-12 Mitsubishi Heavy Ind Ltd 変速操向装置
US6203463B1 (en) 1999-12-16 2001-03-20 Caterpillar Inc. Transmission with variable ratio utilizing three planetaries, five members, a variable speed pump, and a variable speed motor and associated method for operatively connecting components associated therewith
JP2001200900A (ja) 1999-12-16 2001-07-27 Caterpillar Inc 可変比を有するトランスミッションおよび関連成分接続方法
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WO2012171812A1 (fr) * 2011-06-14 2012-12-20 Valtra Oy Ab Transmission de véhicule à répartition du couple à variation continue
JP2017075692A (ja) 2015-09-29 2017-04-20 ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフトＺｆ Ｆｒｉｅｄｒｉｃｈｓｈａｆｅｎ Ａｇ 遊星歯車セットを備えて少なくとも３つの走行レンジを有する無段のパワースプリット型変速機
CN206234335U (zh) 2016-12-07 2017-06-09 重庆大学 作业车辆液压机械复合无级变速器装置
CN110520651A (zh) * 2017-11-24 2019-11-29 株式会社久保田 拖拉机的变速传动装置及拖拉机
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The International Search Report for the corresponding international application No. PCT/JP2020/045392, dated Feb. 22, 2021.

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JP2021139435A (ja) 2021-09-16
EP4056871A1 (fr) 2022-09-14
JP7426259B2 (ja) 2024-02-01
EP4056871B1 (fr) 2024-01-31
EP4056871A4 (fr) 2023-01-04
WO2021176788A1 (fr) 2021-09-10
CN114867952A (zh) 2022-08-05
US20230042113A1 (en) 2023-02-09

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